Share Email Print
cover

Proceedings Paper

Calibration of a combined x-ray and laser imaging system
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

A combined laser 3D and X-ray imaging system is newly developed for food safety inspection. Two kinds of cameras are used in this system. One is CCD camera which is used to provide an accurate thickness profile of the object and the other is X-ray line-scan camera which is to get the high resolution X-ray image. A unique three-step calibration procedure is proposed to calibrate these two kinds of cameras. Firstly, the CCD camera is calibrated to link the CCD pixels to points in 3D world coordinate system. Secondly, the X-ray line-scan camera is calibrated to link points in 3D world coordinate system to the X-ray line sensors. The X-ray fan beam effect is also compensated in this stage. Finally, direct mapping from CCD pixel to X-ray line sensor is realized using the information from the first two calibration steps. Based on the calibration results, look-up tables are also generated to replace the expensive runtime computation with simpler lookup operation. Results show that high accuracy has been achieved with the whole system calibration.

Paper Details

Date Published: 23 October 2006
PDF: 12 pages
Proc. SPIE 6381, Optics for Natural Resources, Agriculture, and Foods, 638111 (23 October 2006); doi: 10.1117/12.685541
Show Author Affiliations
Fenghua Jin, Univ. of Maryland, College Park (United States)
Hansong Jing, Univ. of Maryland, College Park (United States)
Lei Qin, Univ. of Maryland, College Park (United States)
Xin Chen, Univ. of Maryland, College Park (United States)
Yang Tao, Univ. of Maryland, College Park (United States)


Published in SPIE Proceedings Vol. 6381:
Optics for Natural Resources, Agriculture, and Foods
Yud-Ren Chen; George E. Meyer; Shu-I Tu, Editor(s)

© SPIE. Terms of Use
Back to Top